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He said: "It doesn’t matter if you carry a euro or a pound across the border. You can buy your drinks in Belfast in Euros and your drinks in Dublin in Pounds."

Many responded with anger and said that this is not the case, and pointed out that Northern Irish sterling is often refused in mainland UK.

Here's the reality:

What is the official currency in Dublin?

The official currency, which is used across Dublin, is euro and has been since 1 January 2002.

What is the official currency in Northern Ireland?

In Northern Ireland the official currency is pounds sterling as it is a member of the United Kingdom.

(Image: Thomas Trutschel/Photothek via Getty Images)

Can I use pounds to buy a pint in Dublin?

In general, the answer is no. Most pubs in Dublin will only accept euro coins and notes when paying for a pint with cash. But there are some exceptions - it depends on the pub.

For example, you're more likely to find a pub that accepts sterling in Temple Bar because the area is so popular with tourists. Don't expect value for money though, because they usually accept it on a 1:1 basis.

Of course, a lot of pubs accept cards from all over the world so that's often the safest option and it's becoming one of the most popular.

Former Brexit Secretary David Davis gives a media interview on day two of the annual Conservative Party Conference on October 1, 2018 in Birmingham, England (Image: Christopher Furlong/Getty Images)

Can I use euros to buy a pint in Northern Ireland?

You'll probably find it much easier to buy a pint using euro in NI than you would using pound in Dublin.

If you plan to use the European currency however, you need to make sure you have notes because most publicans don't like accepting coins as it's probably more hassle than it's worth for them.